So I figured out what I’ll use fit the wheel. CDs are plentiful, lightweight and strongish. If I laminate a half dozen together, I figure they’ll provide enough stability. I’m still considering linkage. I don’t think the draw is as important as I was thinking based l on the saw design stuff I was reading on Wikipedia. I was figuring a slice side and a rip and toss side to each sawtooth, but it’s a lot more complicated than that. Changing from direct to indirect won’t be a problem if I turn out to be wrong.
The lame bit is the servo situation. See, I have a couple servos that I figured would be perfect. Unfortunately, they’re not servos, but stepper motors, which means I need to look at how to drive those. I’m not feeling the desire to build a gearbox, so I can’t just use a random motor, and a motor sans gearing will totally be short on the torque.
Peter's stuff.